CN112978767A - Treatment process for recycling and reusing industrial mixed salt in caustic soda plant - Google Patents
Treatment process for recycling and reusing industrial mixed salt in caustic soda plant Download PDFInfo
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- CN112978767A CN112978767A CN202110218090.1A CN202110218090A CN112978767A CN 112978767 A CN112978767 A CN 112978767A CN 202110218090 A CN202110218090 A CN 202110218090A CN 112978767 A CN112978767 A CN 112978767A
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- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
- C01D3/08—Preparation by working up natural or industrial salt mixtures or siliceous minerals
Abstract
The invention relates to the field of production and manufacturing, in particular to a treatment process for recycling industrial mixed salt resources in a caustic soda plant. A liquid phase process for recycling and reusing industrial mixed salt resources in a caustic soda plant comprises the following steps: the method comprises the following steps: crushing raw salt by a crusher, and conveying the raw salt particles crushed by the crusher to a salt storage pool; step two: and conveying the raw salt particles in the salt storage tank to the salt dissolving tank through a belt conveyor. Through the design, the industrial waste salt can meet the index of salt for production in the caustic soda plant after being effectively treated by the treatment process, the problem that the waste salt is stored in each unit is solved, the resources are effectively recycled, the pollution to the environment is reduced, and the production cost of the caustic soda plant can be effectively reduced.
Description
Technical Field
The invention relates to the field of production and manufacturing, in particular to a treatment process for recycling and reusing industrial mixed salt in a soda plant.
Background
The resource recycling of industrial waste salt is always a difficult problem in industrial production, the industrial waste salt has high impurity content and large annual production capacity, so that a large amount of dangerous waste salt is stored in each unit and cannot be effectively recycled, the cost of disposing the industrial waste salt as the dangerous waste is high, the resource waste is large, the industrial waste salt is difficult to be accepted by each production unit, the dangerous waste salt cannot be effectively treated by the traditional process, and the salt index of each production unit is difficult to meet.
An effective solution to the problems in the related art has not been proposed yet.
Disclosure of Invention
The invention aims to provide a treatment process for recycling and reusing industrial mixed salt in a soda plant so as to solve at least one technical problem.
In order to achieve the purpose, the invention adopts the following technical scheme:
a liquid phase process for recycling and reusing industrial mixed salt resources in a soda plant is characterized by comprising the following steps:
the method comprises the following steps: crushing raw salt by a crusher, and conveying the raw salt particles crushed by the crusher to a salt storage pool;
step two: conveying the raw salt particles in the salt storage pool to a salt dissolving pool through a belt conveyor, and starting a submersible stirrer and an aeration device in the salt dissolving pool;
step three: conveying the brine in the salt dissolving pool to a multi-media filter, and conveying the brine filtered by the multi-media filter to an activated carbon filtering device again;
step four: the brine filtered by the activated carbon filtering device is conveyed to an ultrafiltration device, and the brine filtered by the ultrafiltration device is conveyed to a primary nanofiltration water tank again;
step five: conveying the salt water in the primary nanofiltration water tank to a primary nanofiltration device, treating the salt water by the primary nanofiltration device to form primary nanofiltration water product and primary nanofiltration concentrated water, conveying the primary nanofiltration water product to a secondary nanofiltration water tank, conveying the primary nanofiltration concentrated water to a super oxidation tank, conveying the primary nanofiltration water product in the secondary nanofiltration water tank to a secondary nanofiltration device, performing salt separation treatment by the secondary nanofiltration device to form secondary nanofiltration water product and secondary nanofiltration concentrated water, conveying the secondary nanofiltration water product to the primary oxidation tank, and conveying the secondary nanofiltration concentrated water to the primary nanofiltration water tank;
step six: adding liquid caustic soda into the secondary nanofiltration water production in the primary oxidation tank, adjusting the pH value of the secondary nanofiltration water production in the primary oxidation tank to 12, adding sodium hypochlorite into the primary oxidation tank, performing breakpoint chlorination, and conveying the liquid in the primary oxidation tank to the secondary oxidation tank;
step seven: conveying the liquid in the secondary oxidation tank to a circulating water tank, starting an ultraviolet catalytic device in the circulating water tank, performing degradation treatment through an ultraviolet lamp and a titanium dioxide plate of the ultraviolet catalytic device, and conveying the liquid treated by the circulating water tank to a brine delivery tank for recycling in a caustic soda plant;
step eight: heating the primary nanofiltration concentrated water entering the super oxidation tank to 115-120 ℃, adding sodium hypochlorite and ferrous sulfate serving as medicaments, reacting for a certain time, adding sodium carbonate into the super oxidation tank again, and adjusting the pH value of liquid in the super oxidation tank to 10-12;
step nine: and (3) conveying the liquid treated by the super oxidation pond to a filter pressing device, treating by the filter pressing device to form filter pressing clear liquid, conveying the filter pressing clear liquid to a clear liquid pond, conveying the filter pressing clear liquid in the clear liquid pond to a refrigerating device, treating the filter pressing clear liquid by the refrigerating device to form frozen supernatant and liquid sodium sulfate, refluxing the frozen supernatant to the salt melting pond for recycling, conveying the liquid sodium sulfate to a centrifugal machine, and dewatering by the centrifugal machine to form sodium sulfate decahydrate.
In the first step, the width of the raw salt particles crushed by the crusher is between 0.5mm and 1.0 mm.
And in the sixth step, after liquid caustic soda is added into the secondary nanofiltration water produced in the primary oxidation tank, a submersible stirrer in the primary oxidation tank is started to uniformly dissolve the liquid caustic soda in the water.
And step seven, the circulating water tank is arranged at the upper part of the secondary oxidation pond.
And step eight, heating the liquid entering the super oxidation pond to 115-120 ℃, simultaneously adding 5ml/L of sodium hypochlorite and 5ml/L of ferrous sulfate, reacting for 3-5 hours, and then adding 30% sodium carbonate into the super oxidation pond again to adjust the pH value of the liquid in the super oxidation pond to 10-12.
A solid phase process for recycling and reusing industrial mixed salt resources in a soda plant is characterized by comprising the following steps:
the method comprises the following steps: crushing raw salt by a crusher, and conveying the raw salt particles crushed by the crusher to a salt storage pool;
step two: conveying the raw salt particles in the salt storage pool to a first ultrasonic salt washing device through a belt conveyor;
step three: after the raw salt particles enter the first ultrasonic salt washing device, starting a first stirring device in the first ultrasonic salt washing device, keeping the first stirring device continuously working, starting a first ultrasonic generator of the first ultrasonic salt washing device, treating the raw salt particles by the first ultrasonic salt washing device to form first salt washing mother liquor and first salt slurry, overflowing the first salt washing mother liquor to a super oxidation pond, and conveying the first salt slurry to a first centrifugal machine;
step four: after the first salt slurry is conveyed to the first centrifugal machine, the first salt slurry is dehydrated by the first centrifugal machine to form a first sodium chloride finished product and a first centrifugal mother liquor, and the first centrifugal mother liquor flows back to the super oxidation pond;
step five: heating the liquid entering the super oxidation tank to 115-120 ℃, adding medicament sodium hypochlorite and ferrous sulfate, reacting for a certain time, adding sodium carbonate into the super oxidation tank again, and adjusting the pH value of the liquid in the super oxidation tank to 10-12;
step six: conveying the liquid treated by the super oxidation pond to a filter pressing device, treating the liquid by the filter pressing device to form filter pressing clear liquid, conveying the filter pressing clear liquid to a clear liquid pond, conveying the filter pressing clear liquid entering the clear liquid pond to a refrigerating device again, treating the filter pressing clear liquid by the refrigerating device to form freezing supernatant liquid and sodium sulfate, refluxing the freezing supernatant liquid to the first ultrasonic salt washing device for recycling, conveying the frozen sodium sulfate to a nitrate settling tank for solid-liquid separation, conveying the sodium sulfate treated by the nitrate settling tank to a second centrifugal machine, performing dehydration treatment by the second centrifugal machine to form sodium sulfate decahydrate and second centrifugal mother liquor, and conveying the second centrifugal mother liquor to the first ultrasonic salt washing device for recycling;
step seven: adding hydrochloric acid into the frozen supernatant and the second centrifugal mother liquor, so that the pH values of the frozen supernatant and the second centrifugal mother liquor are adjusted to 6-7;
step eight: the first sodium chloride finished product formed by the treatment of the first centrifuge is conveyed to a second ultrasonic salt washing device, a second stirring device in the second ultrasonic salt washing device is started, the second stirring device is kept to work continuously, a second ultrasonic generator of the second ultrasonic salt washing device is started, raw salt particles are treated by the second ultrasonic salt washing device to form a second salt washing mother solution and a second salt slurry, the second salt washing mother solution overflows to the super oxidation pond, the second salt slurry is conveyed to a third centrifuge, the second salt slurry is treated by the third centrifuge to form a second sodium chloride finished product and a second centrifugal mother solution, and the second centrifugal mother solution flows back to the clear liquid pond for recycling;
step nine: conveying a second sodium chloride finished product formed by the treatment of the third centrifugal machine to a drying device;
step ten: and (4) producing solid sodium chloride.
In the first step, the width of the raw salt particles crushed by the crusher is between 0.5mm and 1.0 mm.
And fifthly, heating the liquid entering the super oxidation pond to 115-120 ℃, simultaneously adding 5ml/L of sodium hypochlorite and 5ml/L of ferrous sulfate, reacting for 3-5 hours, and then adding 30% sodium carbonate into the super oxidation pond again to adjust the pH value of the liquid in the super oxidation pond to 10-12.
In the sixth step, the pipeline for conveying the second centrifugal mother liquor is connected with the pipeline for conveying the frozen supernatant.
Through the design, the invention provides the treatment process for recycling the industrial mixed salt in the caustic soda plant, and after the industrial waste salt is effectively treated by the treatment process, the industrial waste salt can meet the index of the production salt in the caustic soda plant, the problem that each unit stores dangerous waste salt is solved, the resource is effectively recycled, the environmental pollution is reduced, and the production cost of the caustic soda plant can be effectively reduced.
Drawings
FIG. 1 is a schematic diagram of a partial structural arrangement of a liquid-phase process for recycling and reusing industrial miscellaneous salts in a soda plant according to the present invention;
FIG. 2 is a schematic diagram of a partial structural arrangement of the solid phase process for recycling and reusing the industrial miscellaneous salt resources in the soda plant.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The first embodiment is as follows:
as shown in fig. 1, a liquid phase process for recycling and reusing industrial mixed salt in a soda plant comprises the following steps: the method comprises the following steps: crushing raw salt by a crusher 1, and conveying the raw salt particles crushed by the crusher to a salt storage pool 2; step two: conveying the raw salt particles in the salt storage pool to a salt dissolving pool 3 through a belt conveyor, and starting a submersible stirrer and an aeration device in the salt dissolving pool; step three: conveying the brine in the salt dissolving pool to a multi-media filter 4, and conveying the brine filtered by the multi-media filter to an active carbon filtering device 5 again; step four: the brine filtered by the active carbon filtering device is conveyed to an ultrafiltration device 6, and the brine filtered by the ultrafiltration device is conveyed to a primary nanofiltration water tank 7 again; step five: conveying the salt water in the primary nanofiltration water tank to a primary nanofiltration device 8, treating the salt water by the primary nanofiltration device to form primary nanofiltration water product and primary nanofiltration concentrated water, conveying the primary nanofiltration water product to a secondary nanofiltration water tank 9, conveying the primary nanofiltration concentrated water to a super oxidation tank 14, conveying the primary nanofiltration water product in the secondary nanofiltration water tank to a secondary nanofiltration device 10, performing salt separation treatment by the secondary nanofiltration device to form secondary nanofiltration water product and secondary nanofiltration concentrated water, conveying the secondary nanofiltration water product to a primary oxidation tank 11, and conveying the secondary nanofiltration concentrated water to the primary nanofiltration water tank; step six: adding liquid caustic soda into the secondary nanofiltration water production in the primary oxidation tank, adjusting the pH value of the secondary nanofiltration water production in the primary oxidation tank to 12, adding sodium hypochlorite into the primary oxidation tank, performing breakpoint chlorination, and conveying the liquid in the primary oxidation tank to the secondary oxidation tank 12; step seven: conveying the liquid in the secondary oxidation tank to a circulating water tank, starting an ultraviolet catalytic device in the circulating water tank, performing degradation treatment through an ultraviolet lamp and a titanium dioxide plate of the ultraviolet catalytic device, and conveying the liquid treated by the circulating water tank to a brine delivery tank 13 for recycling in a caustic soda plant; step eight: heating the primary nanofiltration concentrated water entering the super oxidation tank to 115-120 ℃, adding sodium hypochlorite and ferrous sulfate serving as medicaments, reacting for a certain time, adding sodium carbonate into the super oxidation tank again, and adjusting the pH value of liquid in the super oxidation tank to 10-12; step nine: and (2) conveying the liquid treated by the super oxidation pond to a filter pressing device 15, treating the liquid by the filter pressing device to form filter pressing clear liquid, conveying the filter pressing clear liquid to a clear liquid pond 16, conveying the filter pressing clear liquid in the clear liquid pond to a refrigerating device 17, treating the filter pressing clear liquid by the refrigerating device to form freezing supernatant and liquid sodium sulfate, refluxing the freezing supernatant to a salt melting pond for recycling, conveying the liquid sodium sulfate to a centrifugal machine 18, and performing dehydration treatment by the centrifugal machine to form sodium sulfate decahydrate. Through the design, the invention provides a liquid phase process for recycling and reusing industrial mixed salt in a caustic soda plant, and after the industrial waste salt is effectively treated by the treatment process, the industrial waste salt can meet the index of salt for production in the caustic soda plant, the problem that each unit stores dangerous waste salt is solved, the resource is effectively recycled, the pollution to the environment is reduced, and the production cost of the caustic soda plant can be effectively reduced.
In order to ensure the treatment effect on the industrial waste salt, the tank capacity of the salt storage tank is 200m3The tank capacity of the salt dissolving tank is 800m3. In the first step, the width of the raw salt particles crushed by the crusher is between 0.5mm and 1.0 mm. In the second step, the power of the belt conveyor is 15KW/h, and the hourly material conveying amount of the belt conveyor is 80m3. In the third step, the salt water in the salt dissolving pool is conveyed to the multi-medium filter through the high-pressure pump. The multi-media filter is two, and two multi-media filters are used for one standby. The number of the active carbon filtering devices is two, and one of the two active carbon filtering devices is provided withAnd (5) one use. The number of the ultrafiltration devices is two, and one ultrafiltration device is used for standby. And fifthly, carrying out salt separation treatment on the brine through a primary nanofiltration device and a secondary nanofiltration device. The number of the first-stage nanofiltration devices is two, and one of the two first-stage nanofiltration devices is used for standby. Two secondary nanofiltration devices are provided, and one of the two secondary nanofiltration devices is used for standby.
And step six, after liquid caustic soda is added into the secondary nanofiltration produced water in the primary oxidation tank, starting a submersible stirrer in the primary oxidation tank to uniformly dissolve the liquid caustic soda in the water. The liquid alkali can be 32% liquid alkali. And adding 15ml/L of sodium hypochlorite into the primary oxidation tank, performing breakpoint chlorination, and degrading ammonia nitrogen and organic matters in water. The dosage of the liquid caustic soda or sodium hypochlorite is controlled according to the liquid amount entering the primary oxidation tank.
And step seven, arranging the circulating water tank at the upper part of the secondary oxidation pond. Liquid in the secondary oxidation pond is carried to the circulating water tank, starts ultraviolet catalytic unit, and ultraviolet catalytic unit includes ultraviolet lamp and titanium dioxide board, and ultraviolet catalytic unit's ultraviolet lamp sets up in circulating water tank one side, and ultraviolet catalytic unit's titanium dioxide board is fixed on circulating water tank's inner wall. The ultraviolet catalytic device comprises 300 ultraviolet lamps which are uniformly distributed. The titanium dioxide plate is 8m3. The liquid entering the circulating water tank is degraded through an ultraviolet lamp and a titanium dioxide plate of the ultraviolet catalytic device, TOC, heavy metals and toxic and harmful substances in the water are degraded, and the produced water enters a saline water outward-sending pool after being qualified and is sent to a caustic soda plant for recycling.
And step eight, heating the liquid entering the super oxidation pond to 115-120 ℃, simultaneously adding 5ml/L of sodium hypochlorite and 5ml/L of ferrous sulfate, reacting for 3-5 hours, and then adding 30% sodium carbonate into the super oxidation pond again to adjust the pH value of the liquid in the super oxidation pond to 10-12. The dosage of the added sodium hypochlorite and ferrous sulfate is controlled according to the liquid amount entering the super oxidation pond. Organic matters, heavy metals, toxic and harmful substances and the like in the water are removed and recycled. The super oxidation pond is two reaction tanks, but the cycle uses, and two reaction tanks are convenient for improve the reaction efficiency in the super oxidation pond after throwing into the medicament. The tank capacity of a single reaction tank is 200m3. Super-superAnd (4) feeding the water produced by the stage oxidation into a filter pressing device for solid-liquid separation.
The second embodiment is as follows:
as shown in fig. 2, a solid phase process for recycling and reusing industrial mixed salt in a soda plant comprises the following steps: the method comprises the following steps: crushing raw salt by a crusher 14, and conveying the raw salt particles crushed by the crusher to a salt storage pool 15; step two: conveying the raw salt particles in the salt storage pool to a first ultrasonic salt washing device 16 through a belt conveyor; step three: after the raw salt particles enter the first ultrasonic salt washing device, starting a first stirring device 17 in the first ultrasonic salt washing device, keeping the first stirring device continuously working, starting a first ultrasonic generator 18 of the first ultrasonic salt washing device, treating the raw salt particles by the first ultrasonic salt washing device to form first salt washing mother liquor and first salt slurry, overflowing the first salt washing mother liquor to a super oxidation pond 19, and conveying the first salt slurry to a first centrifugal machine 20; step four: after the first salt slurry is conveyed to a first centrifugal machine, the first salt slurry is dehydrated by the first centrifugal machine to form a first sodium chloride finished product and first centrifugal mother liquor, and the first centrifugal mother liquor flows back to the super oxidation pond; step five: heating the liquid entering the super oxidation pond to 115-120 ℃, adding medicament sodium hypochlorite and ferrous sulfate, reacting for a certain time, adding sodium carbonate into the super oxidation pond again, and adjusting the pH value of the liquid in the super oxidation pond to 10-12; step six: conveying the liquid treated by the super oxidation pond to a filter pressing device 21, treating the liquid by the filter pressing device to form filter pressing clear liquid, conveying the filter pressing clear liquid to a clear liquid pond 22, conveying the filter pressing clear liquid entering the clear liquid pond to a refrigerating device 23 again, treating the filter pressing clear liquid by the refrigerating device to form refrigerated supernatant and sodium sulfate, refluxing the refrigerated supernatant to a first ultrasonic salt washing device for recycling, conveying the refrigerated sodium sulfate to a nitrate settling tank 24 for solid-liquid separation, conveying the sodium sulfate treated by the nitrate settling tank to a second centrifugal machine 25, performing dehydration treatment by the second centrifugal machine to form sodium sulfate decahydrate and second centrifugal mother liquor, and conveying the second centrifugal mother liquor to the first ultrasonic salt washing device for recycling; step seven: adding hydrochloric acid into the frozen supernatant and the second centrifugal mother liquor, so that the pH values of the frozen supernatant and the second centrifugal mother liquor are adjusted to 6-7; step eight: the first sodium chloride finished product formed by the treatment of the first centrifuge is conveyed to a second ultrasonic salt washing device 26, a second stirring device 27 in the second ultrasonic salt washing device is started, the second stirring device is kept to work continuously, a second ultrasonic generator 28 of the second ultrasonic salt washing device is started, raw salt particles are treated by the second ultrasonic salt washing device to form second salt washing mother liquor and second salt slurry, the second salt washing mother liquor overflows to a super oxidation pond, the second salt slurry is conveyed to a third centrifuge 29, the second salt slurry is treated by the third centrifuge to form a second sodium chloride finished product and second centrifugal mother liquor, and the second centrifugal mother liquor flows back to a clear liquor pond for recycling; step nine: conveying a second sodium chloride finished product processed by the third centrifugal machine to a drying device 30; step ten: and (4) producing solid sodium chloride. Through the design, the invention provides the solid phase process for recycling the industrial mixed salt resources in the caustic soda plant, and after the industrial waste salt is effectively treated by the treatment process, the industrial waste salt can meet the index of salt for production in the caustic soda plant, the problem that each unit stores dangerous waste salt is solved, the resources are effectively recycled, the environmental pollution is reduced, and the production cost of the caustic soda plant can be effectively reduced.
In the first step, the width of the raw salt particles crushed by the crusher is between 0.5mm and 1.0 mm. In the second step, the power of the belt conveyor is 15KW/h, and the hourly material conveying amount of the belt conveyor is 80m3. In the third step, the salt washing mother liquor formed by processing the raw salt particles through the first ultrasonic salt washing device overflows to the super oxidation pond through a pipeline from the upper part of the first ultrasonic salt washing device, and salt slurry formed by processing the raw salt particles through the first ultrasonic salt washing device is conveyed to the centrifugal machine from the lower part of the first ultrasonic salt washing device through a material pump. In the third step, the first ultrasonic generator is connected with a first ultrasonic transducer arranged on the shell of the first ultrasonic salt washing device. The electric energy is converted into ultrasonic energy to decompose mud and organic matters in the crystal nucleus. The ultrasonic wave of the first ultrasonic generator is 80KW/HZ, and the total power of the first ultrasonic generator is 35 KW/h. The stirring device arranged on the first ultrasonic salt washing device is one, and the power of the stirring device is 3 KW/h. The power of the first centrifuge was 20KW/h and the throughput per hour of the individual first centrifuge was 10m3. Step four of treating the liquidOrganic matter, heavy metal, toxic and harmful substance, etc. can be removed for reuse.
And fifthly, heating the liquid entering the super oxidation pond to 115-120 ℃, simultaneously adding 5ml/L of sodium hypochlorite and 5ml/L of ferrous sulfate, reacting for 3-5 hours, and then adding 30% sodium carbonate into the super oxidation pond again to adjust the pH value of the liquid in the super oxidation pond to 10-12. The dosage of the added sodium hypochlorite and ferrous sulfate is controlled according to the liquid amount entering the super oxidation pond. In the fifth step, the super oxidation pond is two reaction ponds; in the sixth step, three filter pressing devices are provided. The two reaction tanks can be recycled. The tank capacity of a single reaction tank is 200m3. The filter pressing device is divided into three devices, and one device can be used for standby. For example, two of the three filter press devices may be connected to two super oxidation ponds, respectively, and another of the three filter press devices is connected to both super oxidation ponds. The hourly liquid inlet amount of a single filter pressing device is 18m3。
And in the sixth step, conveying the filter-pressed clear liquid in the clear liquid pool to a refrigerating device through a high-pressure pump. The number of the high-pressure pumps is two, and the single high-pressure pump has the treatment capacity of 30m per hour3. The number of freezers was two, and the capacity of the freezer per hour for a single freezer was 10T. In the sixth step, the pipeline for conveying the second centrifugal mother liquor is connected with the pipeline for conveying the frozen supernatant. The centrifugal mother liquor is merged into the frozen supernatant pipeline for recycling, so that the pipeline arrangement is reduced, and the equipment cost is reduced. And conveying the sodium sulfate to a second centrifugal machine through a material pump for dehydration. In the seventh step, 32% industrial hydrochloric acid can be used as the hydrochloric acid. And step eight, connecting a second ultrasonic generator with a second ultrasonic transducer arranged on the shell of the second ultrasonic salt washing device. The electric energy is converted into ultrasonic energy, and the mud and organic matters in the reprocessed crystal nucleus are further decomposed. In the ninth step, two drying devices are provided, the power of a single drying device is 100KW/h, and the treatment capacity of the single drying device per hour is 10T.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A liquid phase process for recycling and reusing industrial mixed salt resources in a soda plant is characterized by comprising the following steps:
the method comprises the following steps: crushing raw salt by a crusher, and conveying the raw salt particles crushed by the crusher to a salt storage pool;
step two: conveying the raw salt particles in the salt storage pool to a salt dissolving pool through a belt conveyor, and starting a submersible stirrer and an aeration device in the salt dissolving pool;
step three: conveying the brine in the salt dissolving pool to a multi-media filter, and conveying the brine filtered by the multi-media filter to an activated carbon filtering device again;
step four: the brine filtered by the activated carbon filtering device is conveyed to an ultrafiltration device, and the brine filtered by the ultrafiltration device is conveyed to a primary nanofiltration water tank again;
step five: conveying the salt water in the primary nanofiltration water tank to a primary nanofiltration device, treating the salt water by the primary nanofiltration device to form primary nanofiltration water product and primary nanofiltration concentrated water, conveying the primary nanofiltration water product to a secondary nanofiltration water tank, conveying the primary nanofiltration concentrated water to a super oxidation tank, conveying the primary nanofiltration water product in the secondary nanofiltration water tank to a secondary nanofiltration device, performing salt separation treatment by the secondary nanofiltration device to form secondary nanofiltration water product and secondary nanofiltration concentrated water, conveying the secondary nanofiltration water product to the primary oxidation tank, and conveying the secondary nanofiltration concentrated water to the primary nanofiltration water tank;
step six: adding liquid caustic soda into the secondary nanofiltration water production in the primary oxidation tank, adjusting the pH value of the secondary nanofiltration water production in the primary oxidation tank to 12, adding sodium hypochlorite into the primary oxidation tank, performing breakpoint chlorination, and conveying the liquid in the primary oxidation tank to the secondary oxidation tank;
step seven: conveying the liquid in the secondary oxidation tank to a circulating water tank, starting an ultraviolet catalytic device in the circulating water tank, performing degradation treatment through an ultraviolet lamp and a titanium dioxide plate of the ultraviolet catalytic device, and conveying the liquid treated by the circulating water tank to a brine delivery tank for recycling in a caustic soda plant;
step eight: heating the primary nanofiltration concentrated water entering the super oxidation tank to 115-120 ℃, adding sodium hypochlorite and ferrous sulfate serving as medicaments, reacting for a certain time, adding sodium carbonate into the super oxidation tank again, and adjusting the pH value of liquid in the super oxidation tank to 10-12;
step nine: and (3) conveying the liquid treated by the super oxidation pond to a filter pressing device, treating by the filter pressing device to form filter pressing clear liquid, conveying the filter pressing clear liquid to a clear liquid pond, conveying the filter pressing clear liquid in the clear liquid pond to a refrigerating device, treating the filter pressing clear liquid by the refrigerating device to form frozen supernatant and liquid sodium sulfate, refluxing the frozen supernatant to the salt melting pond for recycling, conveying the liquid sodium sulfate to a centrifugal machine, and dewatering by the centrifugal machine to form sodium sulfate decahydrate.
2. The liquid-phase process for recycling and reusing the industrial mixed salt in the soda plant as claimed in claim 1, wherein in the step one, the width of the raw salt particles crushed by the crusher is between 0.5mm and 1.0 mm.
3. The liquid-phase process for recycling and reusing the industrial mixed salt in the soda plant as claimed in claim 1, wherein in the sixth step, after the liquid caustic soda is added to the secondary nanofiltration produced water in the primary oxidation tank, a submersible stirrer in the primary oxidation tank is started to uniformly dissolve the liquid caustic soda in the water.
4. The liquid-phase process for recycling industrial miscellaneous salts of soda plants as resources according to claim 1, wherein in the seventh step, the circulating water tank is arranged at the upper part of the secondary oxidation pond.
5. The liquid phase process for recycling and reusing the industrial miscellaneous salts in the soda plant as claimed in claim 1, wherein in the eighth step, after the liquid entering the super oxidation tank is heated to 115-120 ℃, 5ml/L of sodium hypochlorite and 5ml/L of ferrous sulfate are added at the same time, and after the reaction is carried out for 3-5 hours, 30% sodium carbonate is added into the super oxidation tank again to adjust the pH value of the liquid in the super oxidation tank to 10-12.
6. A solid phase process for recycling and reusing industrial mixed salt resources in a soda plant is characterized by comprising the following steps:
the method comprises the following steps: crushing raw salt by a crusher, and conveying the raw salt particles crushed by the crusher to a salt storage pool;
step two: conveying the raw salt particles in the salt storage pool to a first ultrasonic salt washing device through a belt conveyor;
step three: after the raw salt particles enter the first ultrasonic salt washing device, starting a first stirring device in the first ultrasonic salt washing device, keeping the first stirring device continuously working, starting a first ultrasonic generator of the first ultrasonic salt washing device, treating the raw salt particles by the first ultrasonic salt washing device to form first salt washing mother liquor and first salt slurry, overflowing the first salt washing mother liquor to a super oxidation pond, and conveying the first salt slurry to a first centrifugal machine;
step four: after the first salt slurry is conveyed to the first centrifugal machine, the first salt slurry is dehydrated by the first centrifugal machine to form a first sodium chloride finished product and a first centrifugal mother liquor, and the first centrifugal mother liquor flows back to the super oxidation pond;
step five: heating the liquid entering the super oxidation tank to 115-120 ℃, adding medicament sodium hypochlorite and ferrous sulfate, reacting for a certain time, adding sodium carbonate into the super oxidation tank again, and adjusting the pH value of the liquid in the super oxidation tank to 10-12;
step six: conveying the liquid treated by the super oxidation pond to a filter pressing device, treating the liquid by the filter pressing device to form filter pressing clear liquid, conveying the filter pressing clear liquid to a clear liquid pond, conveying the filter pressing clear liquid entering the clear liquid pond to a refrigerating device again, treating the filter pressing clear liquid by the refrigerating device to form freezing supernatant liquid and sodium sulfate, refluxing the freezing supernatant liquid to the first ultrasonic salt washing device for recycling, conveying the frozen sodium sulfate to a nitrate settling tank for solid-liquid separation, conveying the sodium sulfate treated by the nitrate settling tank to a second centrifugal machine, performing dehydration treatment by the second centrifugal machine to form sodium sulfate decahydrate and second centrifugal mother liquor, and conveying the second centrifugal mother liquor to the first ultrasonic salt washing device for recycling;
step seven: adding hydrochloric acid into the frozen supernatant and the second centrifugal mother liquor, so that the pH values of the frozen supernatant and the second centrifugal mother liquor are adjusted to 6-7;
step eight: the first sodium chloride finished product formed by the treatment of the first centrifuge is conveyed to a second ultrasonic salt washing device, a second stirring device in the second ultrasonic salt washing device is started, the second stirring device is kept to work continuously, a second ultrasonic generator of the second ultrasonic salt washing device is started, raw salt particles are treated by the second ultrasonic salt washing device to form a second salt washing mother solution and a second salt slurry, the second salt washing mother solution overflows to the super oxidation pond, the second salt slurry is conveyed to a third centrifuge, the second salt slurry is treated by the third centrifuge to form a second sodium chloride finished product and a second centrifugal mother solution, and the second centrifugal mother solution flows back to the clear liquid pond for recycling;
step nine: conveying a second sodium chloride finished product formed by the treatment of the third centrifugal machine to a drying device;
step ten: and (4) producing solid sodium chloride.
7. The solid-phase process for recycling and reusing the industrial mixed salt in the soda plant as claimed in claim 6, wherein in the step one, the width of the original salt particles crushed by the crusher is between 0.5mm and 1.0 mm.
8. The solid-phase process for recycling and reusing the industrial miscellaneous salts in the soda plant as claimed in claim 6, wherein in the fifth step, after the liquid entering the super oxidation tank is heated to 115-120 ℃, 5ml/L of sodium hypochlorite and 5ml/L of ferrous sulfate are added at the same time, and after the reaction is carried out for 3-5 hours, 30% sodium carbonate is added into the super oxidation tank again to adjust the pH value of the liquid in the super oxidation tank to 10-12.
9. The solid-phase process for recycling and reusing the industrial mixed salt in the soda plant as claimed in claim 6, wherein in the sixth step, the pipeline for conveying the second centrifugal mother liquor is connected with the pipeline for conveying the frozen supernatant.
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